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Growing Black Walnut for Nut Production

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Growing Black Walnut for Nut Production AGROFORESTRY IN ACTION University of Missouri Center for Agroforestry AF1011 - 2009 Growing Black Walnut for Nut Production by William Reid, Nut Crops Specialist, Kansas State University; trees are precocious, producing nuts within seven years Mark Coggeshall, Tree Improvement Specialist, University of of tree establishment, with the first significant commer- Missouri Center for Agroforestry; H.E. "Gene" Garrett, Director, cial harvest starting at about age 10. University of Missouri Center for Agroforestry; and Jerry Van Sambeek, Research Plant Physiologist, USDA Forest Service Every black walnut tree grows wood in the form of limbs, trunk and roots. And as the tree matures, every astern black walnut trees (Juglans nigra) produce walnut tree will produce at least a small nut crop. The Ehigh-value, hardwood products and distinctively question is not whether a walnut tree can grow both flavored, edible nuts. The potential for producing two wood and nuts, but rather which crop you wish to maxi- valuable products from the same tree has captured the mize. In this bulletin, we describe the cultural practices imagination of tree planters for years. Both large and and cultivar choices necessary to maximize nut produc- small black walnut plantations have been established tion from black walnut trees. Recommendations for with the intent to harvest huge nut crops from trees that black walnut timber production can be found in other will eventually produce veneer-quality logs. However, if bulletins such as the “Managers Handbook for Black experience has taught us anything about black walnut, Walnut” (Schlesinger and Funk) and the "Walnut Notes" it is that optimum nut production and optimum wood (Burde) (see Additional Resources, pg. 15). production are not normally produced by the same tree. Nut production vs. wood production Black walnut culture is really the story of two totally different trees all wrapped up into one tree species. The first tree is the walnut timber tree. This tree grows tall and straight in a forest of mixed hardwood trees. Tim- ber-type trees in natural stands or man-made planta- tions are grown closely together with little or no sun- light reaching the forest floor. Looking upwards, you will note a long, branchless trunk topped by a relatively small canopy of leaves with few, if any, nuts among the leaves. Black walnut timber trees often grow more than 80 years to produce high-quality lumber or veneer. The second tree is the walnut orchard tree. The orchard tree, by design, has a short trunk, wide spreading branches, and full canopy (Fig.1). Trees in the orchard are widely spaced to allow sunlight to reach the lowest limbs. Orchard trees may be grafted to cultivars with proven nut-bearing characteristics. Nuts are produced on terminal shoots and throughout the tree’s canopy on short, stout branches or spurs. When grafted to selected cultivars, trees produce thin-shelled black walnuts that yield the high-quality, light-colored kernels that com- Fig. 1: A black walnut orchard has widely spaced mand top price in the marketplace. Grafted orchard trees that develop a full canopy. 1 www.centerforagroforestry.org Setting Goals for the Orchard also make acceptable orchard sites. Commercial or- The ultimate success of a black walnut planting will be chards should not be established on sites that tend to defined by the goals you set for the orchard before a be droughty. Lack of soil moisture during the growing single tree is planted. season will severely affect nut quality and accentuate alternate bearing. Black walnut orchards can be established for Black walnut trees are sensitive to spring frost injury. many reasons, including: Freezing temperatures after the onset of budbreak can • To provide the family with high-quality black wal- result in the loss of a tree’s entire nut crop. When estab- nut kernels; lishing a black walnut orchard, avoid planting trees in • To collect, test or develop black walnut cultivars narrow valleys where frost pockets can develop. as a hobby; • To produce a commercially marketable nut crop. The Natural Resource Conservation Service now has a Black Walnut Suitability Index online. Use the Web Soil Survey at http://websoilsurvey.nrcs.usda.gov/app/ The methods used to establish the orchard and the in- and find the black walnut mapping (for Missouri only) tensity of management used to produce a nut crop will under the "Vegetative Productivity" function. differ depending on the goals you set for the planting. The backyard orchardist often grows a few black walnut Cultivar Selection trees with minimal inputs. Under these conditions, black The production of thin-shelled, high-quality nuts is only walnuts will produce an ample supply of nuts in some possible by growing black walnut trees that have been years allowing the grower to fill his freezer with high- grafted to cultivars known to have these characteristics. quality walnut kernels that can be utilized during years In choosing cultivars for your walnut orchard, review the trees produce little or no nut crop. all cultivar traits but, keep in mind, there is no “perfect” walnut cultivar that provides all positive characteristics In contrast, the commercial orchardist makes major in a single tree. Key cultivar traits include: leafing date, investments in fertilizers and pesticides to ensure maxi- nut weight and percent kernel, disease resistance, and mum annual nut production. In addition, the commer- bearing tendency. Recommended cultivars and their key cial orchard must be large enough to allow the efficient cultivar traits are listed in Table 1, pg. 3. utilization of specialized orchard equipment such as orchard sprayers, tree shakers and mechanical nut har- In addition, Center for Agroforestry black walnut vesters. researchers have created an online tool to aid potential growers in choosing which cultivars will work for them. When drawing up your plans for planting black walnut The tool can be found at http://extension.missouri.edu/ trees, set realistic goals for both yourself and your trees. publications/DisplayPub.aspx?P=XM1001 It is better to take excellent care of fewer trees than to plant too many trees and become frustrated by not be- Leafing and flowering dates Black walnut trees are ing able to keep up with an exhausting work schedule. among the latest trees to break dormancy in eastern de- ciduous forests. Late-leafing is nature’s way of ensuring Site Selection Black walnut trees perform best when grown on deep, well-drained soils. Attempts to establish black walnut trees on shallow soils or excessively wet soils will usu- ally fail. Any soil condition that restricts root penetra- tion to less than 3 feet will slow tree growth and limit nut production. Walnut trees will thrive in soils that range from slightly acidic to slightly basic (pH 6.0 to 7.5) and have a high level of inherit fertility. Problems with pH and low phosphorus need to be corrected during site preparation, along with the removal of tall fescue and other perennial vegetation. (Lime and phosphorus must be incorporated to be effective.) Commercial orchards should only be established on the very best of black walnut sites. These sites are usually found in broad river bottoms where deep, rich soils cre- ate ideal conditions for tree growth. Upland sites with Fig. 2: Catkins are borne on one-year old wood, while pis- deep, fertile soils and excellent water holding capacity tillate flowers appear on the terminal end of new shoots. University of Missouri Center for Agroforestry 2 Table 1: Recommended Black Walnut Cultivars Cultivar Leafing Spur Anthracnose Nut Percent Alternate Ripening Date1 Fruiting Susceptibility Weight (g) Kernel Bearing Season2 Tendency Sparrow 15 no low 19 32 medium early Sparks 127 12 yes high 15 33 high early Tomboy 7 no low 22 27 medium early Emma K 5 yes medium 19 34 high mid Mintle 4 no high 16 31 high mid McGinnis 4 yes medium 17 31 high mid Drake 17 no high 19 30 medium mid Kwik Krop 15 yes medium 17 31 high mid Sparks 147 21 yes medium 17 36 medium mid Sauber 13 yes high 15 32 high mid Football 6 yes high 22 29 high late Hay 23 yes low 22 32 medium late Rupert 8 yes low 18 26 low late Surprise 13 yes high 20 33 low late Thomas 22 no low 22 24 medium late 1Leafing date is recorded as days after Davidson, the earliest leafing cultivar under trial in central Mis- souri. Average leafing date for Davidson in central Missouri = April 12. 2Average ripening dates in central Missouri: early = Sept. 1-14; mid = Sept. 15-28; late = after Sept. 28. emerging leaves, along with developing flowering short, compact branches that arise along primary limbs structures, will not be injured by late spring frosts. (Fig. 3 and 4, pg. 4). These spurs are multi-year-old Temperatures below 26°F will kill emerging buds, shoots that grow to a length of 8 to 12 inches and dra- destroy catkins and pistillate flowers, and eliminate the matically increase the fruit-bearing capacity of the tree potential for nut production. If your planting site has a (Fig. 4, pg. 4). The best yielding black walnut cultivars tendency towards late spring frosts, grafting to late-leaf- are all spur bearing. ing cultivars is essential. Disease resistance Anthracnose is the most common Black walnut trees have separate male and female flow- foliar disease infecting black walnut trees and is a major ers, which are located on different parts of the same cause for poor and irregular nut production (Fig. 5, pg. branch (Fig. 2, pg. 2). Male flowers or catkins start to 4). The anthracnose fungus infects leaves shortly after develop at budbreak along 1-year-old wood.
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